I have a 2000 Mazda Protege 1.6L I have one code, PO171 Bank 1 too lean. I have cleaned the MAF, Checked vacuum lines, spark plugs, and wires. I sprayed throttle body cleaner around to see any changes in engine pick up, Nothing. Still have the code on. I even cleared then code after checking and replacing things. I still have this code. Please help....:(
Well actually you cant clean the mass air flow,you usually ruin it when you clean it,it could be a bad maf or just crapy gas,not crappy enuff that the car doesnt run,but enuff it doesnt like the air/fuel mixture and is setting the light
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Bank lean fault... typical from a vacuum leak or intake manifold leak. Chevy V6 has history with lower intake manifold gasket failure. Check all vacuum hoses, especially the notorious chevy vacuum accumulator line.
these codes refer to the oxygen sensors. PO171 is bank 1 sensor 1 and PO174 is bank 2 sensor 1 detecting too lean a condition. these are what the shops check, check the sensor for switching properly and not stuck in one direction or the other. then check MAF sensor operation and that the hot wire in the sensor is clean and not dirty, it can be cleaned with intake cleaner and gently brushing any dirt off it. if this is good then check fuel supply like pressure/volume, injector function, dirty injectors, vacuum leaks. just some places to start. if you have no or very little knowledge of car repair then go to a shop to get it fixed instead of just throwing unneeded parts at it as it could cost you more.
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.
Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.
Causes: A code P0171 may mean that one or more of the following has happened: * The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. * There could be a vacuum leak downstream of the MAF sensor.
Possible solutions include: * In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling * Inspect all vacuum and PCV hoses, replace if necessary * Check for a dirty fuel filter and proper fuel pressure
this is a 2005 tarus with a code of po171, this code is not a mass air flow sensor code this code is defined as bank 1 system lean, ive run into this many times, this may be caused by a weak fuelpump or a vacuum leak, the most common problem i've found was a vacuum leak, check the pcv system and around intake for split hoses. hope this helps,
ok heres problem 101 is mass air flow sensor 171 running too rich 174 running too lean can find 429 but it the same lines i believe take out your mass air flow sensor and clean it check it connection if comes back on replace the mass air flow sensor
Code PO171- Lean mix of Bank 1. Code PO174- Lean mix of Bank 2.
Most of the time a P0171 and P0174 is caused by either a vacuum
leak--more than likely the PCV hose and valve or a dirty or defective Mass Airflow (MAF)sensor. Low fuel pressure can also cause this condition.
The PCV hose is located on bank one but can affect both sides because
the other end is located on the back of the upper intake manifold.
Usually they deteriorate and get a hole in it.
Clean the the MAF sensor with MAF cleaner, which you can pick up at any Auto parts store and also pick up a bottle of fuel injector cleaner. Good luck and hope this helps.
remove maf sensor and check for air filter debris on it, gently blow off debris taking care not to damamge the wires on the sensor. also check forvaccum leaks as this can cause a lean condition
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